Microsoft Dynamics AX (Archived)

Monthly Standard Deviation Formula

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Posted on by Community Member

Hi,

Can anyone give me the formula for calculating Monthly Standard Deviation field on Safety Stock Journal please?

Thanks in advance

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syed baber 11,633 on at

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Hi Blueberry,

You can check the following method:

\Classes\ReqItemJournalCreate\calcStdDeviationPerMonth

This method is calculating the standard deviation per month and populating StdDeviationIssueMonth field on Safety stock journal.

Please have a look and let me know if you have further queries.

Thanks,

Baber.

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Community Member on at

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Hi Baber,

Is it the same with this following formula?

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fgil12 2,722 on at

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That's the formula for Standard deviation. I don't think that's the same calculation AX performs on the standard deviation per month field.

What I have found is the following:

1) Obtain Average issues per month (Sum all inventory issues of the selected time horizon

and divide by the number of months of the selected time horizon).

2) Sum all inventory issues for every month of the selected time horizon. You will do this

12 times if your Time horizon is 1 year, for example.

3) Substract the total inventory issues for the first month from the Average issues per

month. Then raise to the square. Repeat for the rest of the total inventory issues for the

other months.

4) Sum the squares you obtained in the last step and divide by the number of months

in your time horizon.

5) Get square root of the number you obtaind in the last step.

Hope this helps you.

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AX calculates the same way as mentioned in this example.

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